Method and device for grinding a rotationally symmetric machine part

Abstract

A method and a device for grinding a machine part that has two shaft elements, a machine part axis and a large diameter central element having a side surface which is embodied in the form of a flat truncated cone. The machine part is clamped between centers and is movable in a direction of the machine part axis. The side surface is ground by a cylindrical outer contour of a first grinding wheel such that the cutting speed is constant across the entire axial dimension of the first grinding wheel which is mounted on a grinding spindle along with a second, narrower grinding. The second grinding wheel is positioned to grind the shaft element by swiveling the spindle using two pivots that are located perpendicular to each other and by displacing the grinding spindle perpendicular to the machine part axis with the machine part remaining in the same clamped position.

1. A method for grinding a rotationally-symmetrical workpiece having first and second cylindrical parts and a center part situated therebetween that has an outer diameter surface having a diameter greater than diameters of said first and second cylindrical parts and first and second center part side surfaces respectively disposed between said outer diameter surface and said first and second cylindrical parts:
 providing a grinding spindle having first and second grinding wheels mounted uniaxially thereon at spindle end portion and rotatable about a spindle axis, said first grinding wheel having first and second sides with a first grinding wheel outer circumferential surface therebetween which is substantially cylindrical, said first grinding wheel outer circumferential surface having a profile conforming to and extending a length of said first center part side surface to be ground; 
 chucking said workpiece at ends of the first and second cylindrical parts to place said workpiece in a chucked state; 
 rotating said workpiece about a workpiece rotation axis in said chucked state; 
 supporting said grinding spindle on first and second pivots, said first pivot having a first pivot axis oriented perpendicular to said workpiece rotation axis, and said second pivot having a second pivot axis oriented in a direction perpendicular to said spindle axis and perpendicular to said first pivot axis; 
 pivoting said grinding spindle on said second pivot between a second pivot first position placing said first and second grinding wheels at a first side of said second pivot, and a second pivot second position placing said first and second grinding wheels at a second side of said second pivot opposite said first side of said second pivot; 
 pivoting said grinding spindle on said first pivot to align said grinding spindle axis parallel to a radial angular extension of a mean surface contour of said first center part side surface to orient said first grinding wheel outer circumferential surface for grinding said first center part side; 
 moving said first grinding wheel outer circumferential surface and said first center part side surface relative to one another along said workpiece axis direction with said first grinding wheel outer circumferential surface aligned along a workpiece rotation axis direction with said first center part side surface when said grinding spindle is pivoted to said second pivot first position to profile grind said first center part side surface; 
 pivoting said grinding spindle on said first pivot to align said grinding spindle axis parallel to said workpiece rotation axis to position said second grinding wheel to grind said first cylindrical part when said grinding spindle is in said second pivot first position; 
 grinding said first cylindrical part with said second grinding wheel by moving said first cylindrical part and said second grinding wheel relative to one another along said workpiece rotation axis direction; 
 pivoting said grinding spindle on said first pivot, with said grinding spindle in said second pivot second position, to align said grinding spindle axis parallel to said workpiece rotation axis to position said second grinding wheel to grind said second cylindrical part; and 
 grinding said second cylindrical part with said second grinding wheel by moving said second cylindrical part and said second grinding wheel relative to one another along said workpiece rotation axis direction. 
 
     
     
       2. The method in accordance with  claim 1 , wherein a width of said second grinding wheel is less than that of said first grinding wheel. 
     
     
       3. The method in accordance with  claim 2 , wherein the grinding of the first and cylindrical parts comprises rough-grinding. 
     
     
       4. The method in accordance with  claim 2 , wherein the grinding of the first and cylindrical parts comprises plunge-cut grinding. 
     
     
       5. The method in accordance with  claim 2 , wherein the said workpiece is chucked between centers and driven to rotate by at least one of said centers. 
     
     
       6. The method in accordance with  claim 2 , wherein said workpiece is held horizontally and said first pivot axis is vertical and said second pivot axis is horizontal. 
     
     
       7. The method in accordance with  claim 2 , wherein said first center part side surface forms a truncated cone. 
     
     
       8. The method in accordance with  claim 2 , wherein said first center part side surface is one of concave and convex. 
     
     
       9. The method in accordance with  claim 1 , wherein the grinding of the first and cylindrical parts comprises rough-grinding. 
     
     
       10. The method in accordance with  claim 1 , wherein the grinding of the first and cylindrical parts comprises plunge-cut grinding. 
     
     
       11. The method in accordance with  claim 1 , wherein the said workpiece is chucked between centers and driven to rotate by at least one of said centers. 
     
     
       12. The method in accordance with  claim 1 , wherein said workpiece is held horizontally and said first pivot axis is vertical and said second pivot axis is horizontal. 
     
     
       13. The method in accordance with  claim 1 , wherein said first center part side surface forms a truncated cone. 
     
     
       14. The method in accordance with  claim 1 , wherein said first center part side surface is one of concave and convex. 
     
     
       15. The method in accordance with  claim 1 , wherein said first center part side surface is profile ground before said first cylindrical part is ground and said first cylindrical part is ground before said second cylindrical part is ground.